On July 7th 2011, the cast will walk the red carpet, talk to journalists and chat to fans and competition winners in Trafalgar Square before making their way to cinemas in Leicester Square to watch the film.

Boris Johnson, the Mayor of London, said: 'For the last decade we've been gripped by the on-screen battle between Harry Potter and his arch enemy Lord Voldemort and this is one of the most eagerly awaited films in history. As befits a great British triumph, I can think of no better venue than the iconic surroundings of Trafalgar Square in which to stage the most spectacular of send offs for this dramatic finale.'

The last instalment of the Harry Potter franchise was split into two parts. The first one was released last year and the second half will hit cinemas on July 15.